Heads Together was chosen as the Charity of the Year for the London Marathon, the campaign to end the stipulation surrounding mental health was started by the Duke and Duchess of Cambridge and Prince Harry. One would have hoped that the royal trio would have been able to run alongside their team, but due to security concerns, they will have to settle on the sidelines.

Sian Williams, a Channel 5 news presenter, will be able to run the marathon. She is currently recovering from breast cancer and writing a book on mental health issues.

Speaking to The Express, she said: “The amount of passion the royals have for this cause is really impressive.

“They have researched it, they have personal experience because of the jobs they do – William taking about his role in Air Ambulance and Harry and his role in the military.

“You get a very keen sense it’s something they have been aware of for a very long time and they feel as though they can help get the talking going.

“Obviously they can’t run themselves because there would be 26 miles of royal protection officers so I think having us run it for them as part of a team, they’ll be there to cheer us on.

“For me and for them, there is no greater cause at the moment than addressing mental health and having a parity between mental and physical health.”

Ruling out the 26 miles of protection officers, along with the 500 marathon runner, the three will be cheering on all taking part.

Good Morning Britain’s Sean Fletcher is also running on the Heads Together team and spoke to Prince William about being unable to run alongside them.

“I chatted to Prince William, and he has promised that he will run a marathon in Kenya sometime,” he told Hello! magazine.

Sean is running for his son who has been diagnosed with Obsessive-Compulsive Disorder (OCD). He also had a chance to speak with the Duchess of Cambridge and brought up Prince William’s future marathon plans. “I’ll believe it when I see it,” she responded.

“This is all very new to me — I’m learning very fast because of my son’s situation,” Sean added on. “William’s understanding was incredible, but also his sympathy and empathy with me. He asked me lots of questions. I’ve never met him before, but he’s such a warm man. Like two dads talking together.”

The Duke and Duchess of Cambridge, with Prince Harry, were at the Institue of Contemporary Art yesterday to outline their plans for Heads Together, Prince William believing “that 2017 can mark a tipping point for mental health.”